Glossary “positive” Definition:
1). One of the two poles of a magnet. 2). One of the two terminals of an electrical device, such as a battery. 3). A pressure greater than atmospheric.
p
positive absolute-suction throttling valve
Glossary “positive absolute-suction throttling valve” Definition:
A suction throttling valve having bronze bellows under a nearly perfect vacuum, which is not affected by atmospheric pressure.
positive back-pressure EGR valve
Glossary “positive back-pressure EGR valve” Definition:
A common type of exhaust gas recirculation valve which uses exhaust system backpressure to sense engine load, thus more accurately metering the amount of EGR flow.
positive camber
Glossary “positive camber” Definition:
The outward tilt of a wheel on a vehicle.
pos
Glossary “pos” Definition:
Acronym form of Positive, or Point Of Sale.
posi
Glossary “posi” Definition:
Generic term for a limited-slip differential.
Posi-Traction
Glossary “Posi-Traction” Definition:
A limited-slip differential by Chevrolet.
position indicator pulse (PIP)
Glossary “position indicator pulse (PIP)” Definition:
Signal to determine crankshaft or camshaft position and speed for ignition and/or fuel injection synchronization.
position sensor
Glossary “position sensor” Definition:
Termed used for EGR valve-position sensor.
portable puller
Glossary “portable puller” Definition:
Hydraulic ram and post mounted on caster wheels.
portable vehicle analyzer (PVA)
Glossary “portable vehicle analyzer (PVA)” Definition:
Diagnostic tool which allows monitoring vehicle operation data while the vehicle is being driven.
ported vacuum
Glossary “ported vacuum” Definition:
Engine vacuum, available above the throttle plates of a carburetor or throttle body, used to advance ignition timing when the throttle is opened above its idle position. Make also be used to controll EGR operation.
ported vacuum switch (PVS)
Glossary “ported vacuum switch (PVS)” Definition:
A valve which permits or stops the passage of a ported vacuum to a vacuum-operated component, such as a distributor advance mechanism that may be thermostatically operated, or controlled by electric current or the movement of a mechanical component.
porting
Glossary “porting” Definition:
To enlarge the intake and exhaust passages.
port bowl
Glossary “port bowl” Definition:
Area of the port next to the valve head.
port fuel injection
Glossary “port fuel injection” Definition:
See port injection.
port injection
Glossary “port injection” Definition:
Fuel injection system that injects fuel directly into the individual intake ports.
port runner
Glossary “port runner” Definition:
Partition in the intake manifold that directs the air/fuel mixture to the individual cylinders.
portable power units
Glossary “portable power units” Definition:
Small piston and hydraulic cylinder assembly for removing minor damage.
port
Glossary “port” Definition:
Term used for intake port or exhaust port.